Light conversion adhesive film based on fluorene and pyrene system light conversion material

Abstract

The invention provides a light conversion adhesive film for sunlight wavelength conversion and application thereof, the light conversion adhesive film comprises a compound of formula I and a substrate transparent to visible light, the definition of each group in the compound of formula I is described in the specification, and the mass fraction of the compound of formula I in the light conversion adhesive film is 0.001%-3%. The light conversion adhesive film can be used for a solar cell so as to enhance the efficiency and the stability of the cell.

Description

Technical Field

[0001] This invention belongs to the field of solar cell materials, specifically relating to a light-converting film based on fluorene and pyrene light-converting materials. Background Technology

[0002] Sunlight radiating to the Earth's surface can be categorized by energy into ultraviolet (UV) light, visible light, and infrared light, with UV and deep blue light (<420nm) accounting for approximately 5% of the total solar energy. Due to silicon's band gap of only 1.1eV, this high-energy UV light is typically unusable by silicon-based solar cells, potentially leading to material degradation and device deterioration. Therefore, converting UV light into usable visible light for silicon solar cells can simultaneously improve cell efficiency and lifespan. This conversion can be achieved by introducing light-converting materials into a photoresist film. Such photoresist films are increasingly widely used in the encapsulation of solar cells.

[0003] Existing light-converting materials include organic fluorescent materials, rare-earth materials, or quantum dot materials. For example, Nitto Denko Corporation (CN103339221A) and Zhejiang Foster New Materials Research Institute Co., Ltd. (CN117431022A) have used films containing triazole fluorescent materials; Hanwha Total Co., Ltd. has used films containing pyrene-containing fluorescent materials (CN114335353A); Panasonic Intellectual Property Co., Ltd. (CN116997633A), Hunan Normal University (CN102268261A), and Zhijing Technology Co., Ltd. (CN116970346A) have used films containing materials containing rare-earth metals such as Eu and Ce; Suzhou Hongdao New Materials Co., Ltd. (CN117229728A) and Dalian Institute of Chemical Physics (CN 113035990A) have used films containing materials containing quantum dots such as ZnS and CdS.

[0004] However, while existing fluorescent materials, such as triazoles, exhibit high photoluminescence quantum efficiency (PLQY), they only emit deep blue light, significantly different from the wavelength range where silicon has the highest utilization efficiency. Furthermore, the molecules contain low-energy CN bonds, which may break in the excited state. Rare-earth materials, although emitting long wavelengths (500-700 nm), have narrow emission peaks and low PLQY, making it difficult to efficiently convert ultraviolet light into visible light. Quantum dot materials are expensive, pose environmental risks, and the technology for large-scale production of stable quantum dots is still not mature enough.

[0005] Therefore, there is a need in the art for a light-converting film for solar wavelength conversion that can more effectively improve the efficiency and lifespan of solar cells. Summary of the Invention

[0006] This invention addresses the aforementioned problems in existing technologies by proposing a light-converting film based on fluorene and pyrene light-converting materials, which can be used in solar cells to enhance cell efficiency and stability. Both fluorene and pyrene used in this invention are fluorescent groups, exhibiting strong absorption in the ultraviolet region and ensuring high photoluminescence efficiency (PLQY) of the material. By linking multiple pyrene and fluorene groups to form a large conjugated range, deep blue light absorption can be further achieved, effectively broadening and redshifting the material's emission, thus matching the absorption of silicon-based cells. Furthermore, pyrene and fluorene contain only high-bond-energy C-C single and double bonds, resulting in significantly higher ultraviolet stability compared to materials containing C-heteroatoms (such as CN bonds). Building upon pyrene and fluorene, this invention also preferably introduces a large number of long alkyl chains into the molecule to enhance the material's compatibility with ethylene-vinyl acetate copolymer (EVA) and inhibit its migration. Therefore, the light-converting material of the present invention can not only efficiently convert ultraviolet and deep blue light into sky blue to yellow-green light with high battery utilization efficiency, effectively improving battery efficiency, but also more effectively improve battery life.

[0007] Specifically, one aspect of the present invention provides a light-converting film for sunlight wavelength conversion, the light-converting film comprising a compound of formula I and a matrix transparent to visible light.

[0008]

[0009] In Formula I, R1 is selected from hydrogen atom, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl and C3-C10 cycloalkyl. The C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl and C3-C10 cycloalkyl of R1 can be substituted by one or more substituents selected from halogen atom, hydroxyl, amino, ester, amide, C1-C10 alkoxy, cyano and trifluoromethyl.

[0010] Ar1, Ar2, Ar3, Ar4, and Ar5 are each independently selected from hydrogen atoms, C6-C20 aryl groups, and 5-20 heteroaryl groups. The C6-C20 aryl groups and 5-20 heteroaryl groups of Ar1, Ar2, Ar3, Ar4, and Ar5 can be substituted by one or more substituents selected from C1-C10 alkyl groups, C2-C10 alkenyl groups, and C2-C10 alkynyl groups. The C1-C10 alkyl groups, C2-C10 alkenyl groups, and C2-C10 alkynyl groups can be substituted by one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, and trifluoromethyl groups.

[0011] R2 and R3 are each independently selected from hydrogen atoms, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C3-C10 cycloalkyl, C6-C20 aryl, and 5-20 heteroaryl groups. The C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C3-C10 cycloalkyl, C6-C20 aryl, and 5-20 heteroaryl groups of R2 and R3 can be substituted by one or more substituents selected from halogen atoms, hydroxyl, amino, ester, amide, C1-C10 alkoxy, cyano, and trifluoromethyl groups.

[0012] Ar6 is selected from hydrogen atoms, C6-C20 aryl groups and 5-20 heteroaryl groups. The C6-C20 aryl groups and 5-20 heteroaryl groups of Ar6 can be substituted by one or more substituents selected from C1-C10 alkyl groups. The C1-C10 alkyl groups can be substituted by one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups and trifluoromethyl groups.

[0013] At least one of the groups R1, R2 and R3 is not a hydrogen atom;

[0014] The mass fraction of the compound of formula I in the optical transfer film is 0.001% to 3%.

[0015] In one or more embodiments, the mass fraction of the compound of formula I in the light-converting film is 0.01% to 0.5%.

[0016] In one or more embodiments, Ar1, Ar2, Ar3, Ar4, and Ar5 are each independently selected from hydrogen atoms and 9H-fluorene-2-yl, wherein the two hydrogen atoms at the 9th position of the 9H-fluorene-2-yl may be substituted by one or two substituents selected from C1-C10 alkyl, C2-C10 alkenyl, and C2-C10 alkynyl, wherein the C1-C10 alkyl, C2-C10 alkenyl, and C2-C10 alkynyl may be substituted by one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, and trifluoromethyl groups.

[0017] In one or more embodiments, Ar6 is a hydrogen atom or a pyrene-1-yl group, which may be substituted with one or more substituents selected from C1-C10 alkyl groups, which may be substituted with one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, and trifluoromethyl groups.

[0018] In one or more embodiments, R1 is selected from hydrogen atoms and C1-C10 alkyl groups, and the C1-C10 alkyl group as R1 may be substituted with one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups and trifluoromethyl groups.

[0019] In one or more embodiments, R2 and R3 are each independently selected from C1-C10 alkyl groups, and the C1-C10 alkyl groups of R2 and R3 may be substituted by one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups and trifluoromethyl groups.

[0020] In one or more embodiments, in Formula I, Ar1, Ar2 and Ar5 are each independently 9H-fluorene-2-yl groups in which two hydrogen atoms at the 9 position are replaced by two substituents selected from C1-C10 alkyl groups, Ar3 and Ar4 are hydrogen atoms, R1 is selected from hydrogen atoms and C1-C10 alkyl groups, R2 and R3 are each independently selected from C1-C10 alkyl groups, and Ar6 is a hydrogen atom.

[0021] In one or more embodiments, in Formula I, Ar3, Ar4 and Ar5 are each independently 9H-fluorene-2-yl groups in which two hydrogen atoms at the 9 position are replaced by two substituents selected from C1-C10 alkyl groups, Ar1 and Ar2 are hydrogen atoms, R1 is selected from hydrogen atoms and C1-C10 alkyl groups, R2 and R3 are each independently selected from C1-C10 alkyl groups, and Ar6 is a hydrogen atom.

[0022] In one or more embodiments, in Formula I, Ar5 is a 9H-fluorene-2-yl group in which the two hydrogen atoms at the 9 position are replaced by two substituents selected from C1-C10 alkyl groups, Ar1, Ar2, Ar3 and Ar4 are hydrogen atoms, R1 is selected from hydrogen atoms and C1-C10 alkyl groups, R2 and R3 are each independently selected from C1-C10 alkyl groups, and Ar6 is a hydrogen atom.

[0023] In one or more embodiments, in Formula I, Ar1, Ar2, Ar3, Ar4, and Ar5 are hydrogen atoms, R1 is selected from hydrogen atoms and C1-C10 alkyl groups, R2 and R3 are each independently selected from C1-C10 alkyl groups, and the C1-C10 alkyl groups as R2 and R3 can be substituted by one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, and trifluoromethyl groups, and Ar6 is pyrene-1-yl, which can be substituted by one or more substituents selected from C1-C10 alkyl groups.

[0024] In one or more embodiments, compound I is selected from one or more of compounds 1 to 4:

[0025]

[0026]

[0027] In compounds 1-4, n-C6H 13 represents n-hexyl, n-Bu represents n-butyl, and Et represents ethyl.

[0028] In one or more embodiments, the matrix is ​​selected from one or more of polyethylene terephthalate, polyvinyl butyral, ethylene-vinyl acetate copolymer, polyethylene, ethylene polytetrafluoroethylene, polyimide, polycarbonate, polystyrene, polyurethane, polyacrylate, siloxane sol, siloxane gel and polyolefin elastomer.

[0029] In one or more embodiments, the refractive index of the matrix is ​​1.4-1.7.

[0030] In one or more embodiments, the light-converting film further includes one or more additives selected from crosslinking agents, co-crosslinking agents, plasticizers, antioxidants, and water-absorbing agents; preferably, the light-converting film includes crosslinking agents and co-crosslinking agents, and optionally further includes one or more additives selected from plasticizers, antioxidants, and water-absorbing agents.

[0031] In one or more embodiments, the thickness of the light-converting adhesive film is 0.1-1.0 mm.

[0032] Another aspect of the present invention provides a method for preparing the light-converting adhesive film according to any embodiment herein, the method comprising: mixing the components of the light-converting adhesive film evenly, melting and extruding them into a film, and cooling and shaping them to obtain the light-converting adhesive film.

[0033] Another aspect of the present invention provides a solar cell module comprising the light-converting adhesive film described in any embodiment herein.

[0034] In one or more embodiments, the solar cell module includes one or more of the following devices: PN junction devices containing group III-V or II-IV elements, Cu-In-Ga-Se thin film devices, organic sensitizer devices, organic thin film devices, quantum dot thin film devices, amorphous silicon solar cells, microcrystalline silicon solar cells, and crystalline silicon solar cell devices.

[0035] Another aspect of the present invention provides a method for enhancing the efficiency and stability of a solar cell, the method comprising: introducing a light-converting adhesive film as described in any embodiment herein into the solar cell.

[0036] In one or more embodiments, the solar cell includes one or more of the following devices: PN junction devices containing group III-V or II-IV elements, Cu-In-Ga-Se thin film devices, organic sensitizer devices, organic thin film devices, quantum dot thin film devices, amorphous silicon solar cell devices, microcrystalline silicon solar cell devices, and crystalline silicon solar cell devices. Attached Figure Description

[0037] Figure 1 The absorption-emission spectra of the light-converting materials used in Examples 1-4 of this invention are shown.

[0038] Figure 2 This is a comparison of the absorption-emission spectra of the light-converting material used in Example 1 of this invention and the triazole material used in Comparative Example 2.

[0039] Figure 3 This is a comparison of the in-situ photoluminescence attenuation of the light-converting films prepared in Examples 1-4 of this invention and the light-converting films prepared in Comparative Example 2. Detailed Implementation

[0040] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used herein are explained and defined in general terms below. Unless otherwise specified, all technical and scientific terms used herein have the common meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0041] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0042] In this document, the terms “contains,” “includes,” “containing,” and similar terms encompass the meanings of “basically composed of” and “composed of.” For example, when this document discloses “A contains B and C,” “A is basically composed of B and C” and “A is composed of B and C” should be considered as having been disclosed in this document.

[0043] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0044] Unless otherwise specified, percentages refer to mass percentages and proportions refer to mass ratios in this article.

[0045] In this document, when describing embodiments or examples, it should be understood that it is not intended to limit the invention to those embodiments or examples. Rather, all alternatives, modifications, and equivalents of the methods and materials described herein are covered within the scope defined by this invention.

[0046] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0047] Ideal light-converting materials should exhibit strong absorption of ultraviolet and deep blue light below 420nm, long emission wavelength, broad emission spectrum, high PLQY, and high stability.

[0048] The fluorene and pyrene groups used in this invention are both fluorescent groups, exhibiting strong absorption in the ultraviolet region and ensuring high PLQY of the material. By linking multiple pyrene and fluorene groups to form a large conjugated range, deep blue light absorption can be further enhanced, effectively broadening and redshifting the material's emission, thus matching the absorption of silicon-based solar cells. Furthermore, pyrene and fluorene contain only high-bond-energy C-C single and double bonds, resulting in significantly higher ultraviolet stability compared to materials containing C-heteroatoms (such as CN bonds). In addition to pyrene and fluorene, this invention preferably introduces a large number of long alkyl chains into the molecule to enhance the material's compatibility with EVA and inhibit its migration. Therefore, the light-converting material of this invention not only efficiently converts ultraviolet and deep blue light into high-efficiency sky blue to yellow-green light, effectively improving battery efficiency, but also significantly extends battery life.

[0049] The light-converting material in the light-converting film of the present invention is mainly composed of fluorene and pyrene. The mass fraction of the light-converting material in the light-converting film can be 0.001% to 3%. In some preferred embodiments, the mass fraction of the light-converting material in the light-converting film is 0.01% to 0.5%, for example, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5%. Controlling the amount of the light-converting material selected in the present invention in the light-converting film within the aforementioned preferred range is beneficial to improving the effect of the light-converting film on enhancing battery efficiency and stability.

[0050] Furthermore, the light-converting film of the present invention may optionally or preferably include additives. Available additives include, but are not limited to, crosslinking agents, co-crosslinking agents, plasticizers, antioxidants, and water-absorbing agents.

[0051] In some embodiments, the light-converting film of the present invention comprises a light-converting material, a matrix, and optional additives.

[0052] Formula I compound

[0053] In this invention, the structure of the compound of formula I used as a light-converting material is shown below:

[0054]

[0055] In Formula I, R1 is selected from hydrogen atom, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl and C3-C10 cycloalkyl. The C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl and C3-C10 cycloalkyl of R1 can be substituted by one or more substituents selected from halogen atom, hydroxyl, amino, ester, amide, C1-C10 alkoxy, cyano and trifluoromethyl.

[0056] Ar1, Ar2, Ar3, Ar4, and Ar5 are each independently selected from hydrogen atoms, C6-C20 aryl groups, and 5-20 heteroaryl groups. The C6-C20 aryl groups and 5-20 heteroaryl groups of Ar1, Ar2, Ar3, Ar4, and Ar5 can be substituted by one or more substituents selected from C1-C10 alkyl groups, C2-C10 alkenyl groups, and C2-C10 alkynyl groups. The C1-C10 alkyl groups, C2-C10 alkenyl groups, and C2-C10 alkynyl groups can be substituted by one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, and trifluoromethyl groups.

[0057] R2 and R3 are each independently selected from hydrogen atoms, C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C3-C10 cycloalkyl, C6-C20 aryl, and 5-20 heteroaryl groups. The C1-C10 alkyl, C2-C10 alkenyl, C2-C10 alkynyl, C3-C10 cycloalkyl, C6-C20 aryl, and 5-20 heteroaryl groups of R2 and R3 can be substituted by one or more substituents selected from halogen atoms, hydroxyl, amino, ester, amide, C1-C10 alkoxy, cyano, and trifluoromethyl groups.

[0058] Ar6 is selected from hydrogen atoms, C6-C20 aryl groups and 5-20 heteroaryl groups. The C6-C20 aryl groups and 5-20 heteroaryl groups of Ar6 can be substituted by one or more substituents selected from C1-C10 alkyl groups. The C1-C10 alkyl groups can be substituted by one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups and trifluoromethyl groups.

[0059] At least one of the groups R1, R2, and R3 is not a hydrogen atom.

[0060] In this invention, alkyl refers to a monovalent saturated group composed of carbon atoms and hydrogen atoms, having a straight-chain or branched structure. In this invention, the number of carbon atoms preceding the group indicates the number of carbon atoms contained in the group; for example, C1 alkyl represents an alkyl group containing one carbon atom, i.e., methyl. Alkyl groups suitable for this invention can be C1-C10 alkyl groups, such as C1 alkyl, C2 alkyl, C3 alkyl, C4 alkyl, C5 alkyl, C6 alkyl, C7 alkyl, C8 alkyl, C9 alkyl, and C10 alkyl.

[0061] In this invention, alkoxy refers to -O-alkyl.

[0062] In this invention, alkenyl refers to an unsaturated monovalent group containing carbon-carbon double bonds, which has a straight-chain or branched structure composed of carbon atoms and hydrogen atoms. The alkenyl groups suitable for this invention can be C2-C10 alkenyl groups, such as C2 alkenyl, C3 alkenyl, C4 alkenyl, C5 alkenyl, C6 alkenyl, C7 alkenyl, C8 alkenyl, C9 alkenyl, and C10 alkenyl.

[0063] In this invention, alkynyl refers to an unsaturated monovalent group containing a carbon-carbon triple bond, which has a straight-chain or branched structure composed of carbon atoms and hydrogen atoms. The alkynyl groups suitable for this invention can be C2-C10 alkynyl groups, such as C2 alkynyl, C3 alkynyl, C4 alkynyl, C5 alkynyl, C6 alkynyl, C7 alkynyl, C8 alkynyl, C9 alkynyl, and C10 alkynyl.

[0064] In this invention, cycloalkyl refers to a monovalent saturated group with an aliphatic ring structure composed of carbon atoms and hydrogen atoms, and the cycloalkyl group is connected to other parts of the molecule through carbon atoms on the aliphatic ring. The cycloalkyl groups suitable for this invention can be C3-C10 cycloalkyl groups, such as C3 cycloalkyl, C4 cycloalkyl, C5 cycloalkyl, C6 cycloalkyl, C7 cycloalkyl, C8 cycloalkyl, C9 cycloalkyl, and C10 cycloalkyl.

[0065] In this invention, aryl refers to a monovalent group with an aromatic ring structure composed of carbon atoms and hydrogen atoms, and the aryl group is connected to other parts of the molecule through the carbon atoms on the aromatic ring. The aryl groups suitable for this invention can be C6-C20 aryl groups, including but not limited to C6 aryl (e.g., phenyl), C10 aryl (e.g., naphthyl), C13 aryl (e.g., 9H-fluorene-2-yl), C14 aryl (e.g., anthracene, phenanthrene), and C16 aryl (e.g., pyrene).

[0066] In this invention, a heteroaryl group refers to a monovalent group with an aromatic ring structure composed of carbon atoms, hydrogen atoms, and heteroatoms (e.g., sulfur atoms, nitrogen atoms, and oxygen atoms), and the heteroaryl group is connected to other parts of the molecule through carbon atoms or heteroatoms on the aromatic ring. The heteroaryl group suitable for this invention can be a 5-20 member heteroaryl group, where 5-20 indicates that the number of cyclic atoms in the heteroaryl group is 5-20.

[0067] In this invention, alkyl, alkenyl, alkynyl, cycloalkyl, aryl, and heteroaryl groups can be substituted by other substituents, including but not limited to halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, alkoxy groups, cyano groups, and trifluoromethyl groups.

[0068] In this invention, halogen atoms include fluorine, chlorine, bromine, and iodine.

[0069] In this invention, the amino group refers to -NR. a R b R a and R b Each is independently selected from H, C1-C10 alkyl, C2-C10 alkenyl, and C2-C10 alkynyl.

[0070] In some preferred embodiments, R1 is selected from hydrogen atoms and C1-C10 alkyl groups, and the C1-C10 alkyl group as R1 may be substituted with one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, and trifluoromethyl groups. In some embodiments, R1 is selected from hydrogen atoms and C1-C6 alkyl groups (e.g., methyl, ethyl, propyl, butyl, pentyl, hexyl). In some embodiments, R1 is selected from hydrogen atoms and C3-C5 alkyl groups. In some embodiments, R1 is selected from hydrogen atoms and tert-butyl (t-Bu).

[0071] In some preferred embodiments, Ar1, Ar2, Ar3, Ar4, and Ar5 are each independently selected from a hydrogen atom and a 9H-fluorene-2-yl group, wherein the two hydrogen atoms at the 9-position of the 9H-fluorene-2-yl group can be substituted by one or two substituents selected from C1-C10 alkyl, C2-C10 alkenyl, and C2-C10 alkynyl groups, which can be substituted by one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, and trifluoromethyl groups. In some preferred embodiments, Ar1, Ar2, Ar3, Ar4, and Ar5 are each independently selected from a hydrogen atom and a 9H-fluorene-2-yl group substituted with a C1-C10 alkyl group (preferably C6-C10 alkyl, such as C6 alkyl, C7 alkyl, C8 alkyl, C9 alkyl, or C10 alkyl).

[0072] In some embodiments, at least one of Ar1, Ar2, Ar3, Ar4, and Ar5 has two hydrogen atoms at the 9-position replaced by a 9H-fluorene-2-yl group consisting of C1-C10 alkyl groups (preferably C6-C10 alkyl groups, such as C6 alkyl, C7 alkyl, C8 alkyl, C9 alkyl, and C10 alkyl groups). For example, the two hydrogen atoms at the 9-position of the 9H-fluorene-2-yl group can each be independently replaced by a group selected from n-hexyl and 2-ethyl-n-hexyl (-CH2CH(CH2CH3)CH2CH2CH2CH3).

[0073] In this invention, the structural formula of 9H-fluorene-2-yl is as follows: The asterisk (*) indicates the position where the 9H-fluorene-2- group is attached to other parts of the compound.

[0074] In some preferred embodiments, R2 and R3 are each independently selected from C1-C10 alkyl groups (preferably C6-C10 alkyl groups, such as C6 alkyl, C7 alkyl, C8 alkyl, C9 alkyl, and C10 alkyl groups). The C1-C10 alkyl groups of R2 and R3 can be substituted with one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, and trifluoromethyl groups. In some preferred embodiments, R2 and R3 are each independently selected from C6-C10 alkyl groups (e.g., C6 alkyl, C7 alkyl, C8 alkyl, C9 alkyl, and C10 alkyl groups) and ethyl butyrate group (-CH2CH2CH2COOCH2CH3). For example, R2 and R3 can each be independently selected from n-hexyl, 2-ethyl-n-hexyl, and ethyl butyrate group.

[0075] In some embodiments, Ar6 is a hydrogen atom or a pyrene-1-yl group, wherein the pyrene-1-yl group may be substituted with one or more substituents selected from C1-C10 alkyl groups, wherein the C1-C10 alkyl group may be substituted with one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, and trifluoromethyl groups. In some embodiments, Ar6 is a pyrene-1-yl group substituted with a hydrogen atom or one or more substituents selected from C1-C10 alkyl groups (preferably C1-C6 alkyl groups, such as methyl, ethyl, propyl, butyl, pentyl, and hexyl). The substituent on the pyrene-1-yl group may be located at the 7-position of the pyrene-1-yl group.

[0076] In some embodiments, Ar1, Ar2, and Ar5 are each independently a 9H-fluorene-2-yl group in which the two hydrogen atoms at the 9-position are replaced by two substituents selected from C1-C10 alkyl groups; Ar3 and Ar4 are hydrogen atoms; R1 is selected from hydrogen atoms and C1-C10 alkyl groups; R2 and R3 are each independently selected from C1-C10 alkyl groups; and Ar6 is a hydrogen atom; or

[0077] In some embodiments, Ar3, Ar4, and Ar5 are each independently a 9H-fluorene-2-yl group in which the two hydrogen atoms at the 9-position are replaced by two substituents selected from C1-C10 alkyl groups; Ar1 ​​and Ar2 are hydrogen atoms; R1 is selected from hydrogen atoms and C1-C10 alkyl groups; R2 and R3 are each independently selected from C1-C10 alkyl groups; and Ar6 is a hydrogen atom; or

[0078] In some embodiments, Ar5 is a 9H-fluorene-2-yl group in which the two hydrogen atoms at the 9-position are replaced by two substituents selected from C1-C10 alkyl groups; Ar1, Ar2, Ar3, and Ar4 are hydrogen atoms; R1 is selected from hydrogen atoms and C1-C10 alkyl groups; R2 and R3 are each independently selected from C1-C10 alkyl groups; and Ar6 is a hydrogen atom; or

[0079] In some embodiments, Ar1, Ar2, Ar3, Ar4, and Ar5 are hydrogen atoms, R1 is selected from hydrogen atoms and C1-C10 alkyl groups, R2 and R3 are each independently selected from C1-C10 alkyl groups, and the C1-C10 alkyl groups as R2 and R3 can be substituted by one or more substituents selected from halogen atoms, hydroxyl groups, amino groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups, and trifluoromethyl groups, and Ar6 is pyrene-1-yl, which can be substituted by one or more substituents selected from C1-C10 alkyl groups.

[0080] In some embodiments, Ar1, Ar2, Ar3, Ar4 and Ar5 are all hydrogen atoms, and Ar6 is a pyrene-1-yl group substituted with a hydrogen atom or one or more substituents selected from C1-C10 alkyl groups (preferably C1-C6 alkyl groups, such as methyl, ethyl, propyl, butyl, pentyl, hexyl).

[0081] Compound 1, Compound 2, Compound 3, Compound 4

[0082] In some preferred embodiments, the light-converting film of the present invention comprises a compound selected from one or more of compound 1, compound 2, compound 3, and compound 4 as the light-converting material, and a matrix:

[0083]

[0084]

[0085] In some preferred embodiments, the light-converting material is selected from compound 1, compound 2, and compound 3, more preferably from compound 1 and compound 2, and most preferably from compound 1. This is beneficial for improving the effect of the light-converting film on enhancing battery efficiency and stability.

[0086] In this invention, the hydrogen atoms in compounds 1, 2, 3 and 4, which are light-converting materials, can be protium or deuterium.

[0087] Source of compounds

[0088] In this invention, the compounds of formula I, compounds 1 to 4, which serve as light-converting materials, can be prepared using known methods, for example, by referring to the methods described in the following literature: Feng, X.; et al. Influence of substituent position on thermal properties, photoluminescence and morphology of pyrene–fluorene derivatives. J. Mol. Struct. 2015, 1086, 216-222. http: / / dx.doi.org / 10.1016 / j.molstruc.2015.01.018; Sumi, K.; et al. Synthesis of a Highly Luminescent Three-Dimensional Pyrene Dye Based on the Spirobifluorene Skeleton. Molecules. Molecules 2010, 15, 7582-7592; http: / / dx.doi.org / 10.3390 / molecules15117582.

[0089] Compound I, and compounds 1 through 4, are also available through commercial channels.

[0090] matrix

[0091] In this invention, the substrate is preferably transparent to visible light. A substrate with a visible light transmittance ≥ 0.85 is considered transparent to visible light.

[0092] The matrix is ​​made of polymeric materials, including but not limited to: polyethylene terephthalate, polyvinyl butyral, ethylene-vinyl acetate copolymer, polyethylene, ethylene polytetrafluoroethylene, polyimide, polycarbonate, polystyrene, polyurethane, polyacrylate, siloxane sol-gel, polyolefin elastomer, and combinations thereof.

[0093] The refractive index of the matrix is ​​preferably 1.4-1.7, such as 1.4, 1.5, 1.6, or 1.7. This is beneficial for improving the effect of the light-converting film on enhancing the efficiency and stability of the battery.

[0094] The matrix can account for 80% to 99.8% of the mass of the light-converting film, for example, 90%, 95%, 96%, 97%, 98%, 98.5%, 98.9%, 99%, and 99.5%.

[0095] Additives

[0096] The additives applicable to this invention include, but are not limited to, those selected from crosslinking agents, co-crosslinking agents, plasticizers, antioxidants, and water-absorbing agents.

[0097] In some preferred embodiments, the additives include crosslinking agents, such as tert-butyl peroxyisopropyl carbonate. The crosslinking agent preferably accounts for 0.1%-1% of the mass fraction of the light-converting film, for example, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, or 0.9%. This is beneficial for improving the effectiveness of the light-converting film in enhancing battery efficiency and stability.

[0098] In some preferred embodiments, the additives include a co-crosslinking agent, such as trimethylolpropane tetraacrylate. The crosslinking agent preferably accounts for 0.1% to 1% of the mass fraction of the light-converting film, for example, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, or 0.9%. This is beneficial for improving the effectiveness of the light-converting film in enhancing battery efficiency and stability.

[0099] In some preferred embodiments, the matrix is ​​EVA, the crosslinking agent is tert-butyl peroxycarbonate isopropyl ester, and the co-crosslinking agent is trimethylolpropane tetraacrylate. This is beneficial for improving the effect of the light transfer film on enhancing battery efficiency and stability.

[0100] In this invention, plasticizers, antioxidants, and water-absorbing agents are optionally or preferably added to the light-converting film, and their dosage can be conventional.

[0101] In some embodiments, the thickness of the light-converting adhesive film of the present invention is 0.1-1.0 mm, for example 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1.0 mm.

[0102] Preparation method of light transfer film

[0103] The light-converting adhesive film of the present invention can be obtained by mixing the components of the light-converting adhesive film evenly, melting and extruding them into a film, and then cooling and shaping it.

[0104] The melt extrusion temperature can be 80–120°C, for example, 90°C, 100°C, or 110°C. Cooling and setting can be carried out at room temperature (e.g., 25°C).

[0105] Solar cell modules

[0106] Under high temperature and negative pressure conditions, the light-converting adhesive film of the present invention is laminated and encapsulated on a back sheet (e.g., a glass plate) as a front adhesive film with a solar cell (e.g., a monocrystalline silicon solar cell) and a back adhesive film (the material can be pure EVA). After the module is cooled, the light-converting adhesive film becomes the front surface of the module, and the back adhesive film becomes the back surface of the module, thus obtaining a solar cell module.

[0107] In some preferred embodiments, the solar cell module includes at least one of the following devices: a PN junction device containing group III-V or II-IV elements, a Cu-In-Ga-Se (CIGS) thin film device, an organic sensitizer device, an organic thin film device, a quantum dot thin film device, an amorphous silicon solar cell, a microcrystalline silicon solar cell, and a crystalline silicon solar cell device.

[0108] This invention utilizes a fluorene and pyrene-based light-converting material to achieve both high efficiency and stability in both the material and the film. The invention offers the following advantages: both fluorene and pyrene are fluorescent groups, exhibiting strong absorption in the ultraviolet region and ensuring high photoluminescence efficiency (PLQY) in the material. By linking multiple pyrene and fluorene groups to form a large conjugated range, deep blue light absorption can be further enhanced, effectively broadening and redshifting the material's emission, thus matching the absorption of silicon-based solar cells. Furthermore, pyrene and fluorene contain only high-bond-energy C-C single and double bonds, resulting in significantly higher ultraviolet stability compared to materials containing C-heteroatoms (such as CN bonds). Based on pyrene and fluorene, this invention preferably introduces a large number of long alkyl chains into the molecule to enhance the material's compatibility with EVA and inhibit its migration. Therefore, the light-converting material of this invention not only efficiently converts ultraviolet and deep blue light into high-efficiency sky-blue to yellow-green light, effectively improving battery efficiency, but also significantly extends battery life. In this invention, the light-converting material in the film is a fluorescent material based on pyrene and fluorene. This type of material can effectively absorb ultraviolet light below 400nm and emit strong blue fluorescence, effectively improving the efficiency and lifespan of the battery.

[0109] The present invention will be described below by way of specific embodiments. It should be understood that these embodiments are merely illustrative and are not intended to limit the scope of the invention. The methods, reagents, and materials used in the embodiments are conventional methods, reagents, and materials in the art, unless otherwise stated. The compounds in the embodiments are all commercially available.

[0110] Example 1

[0111] This embodiment provides a method using compound 1 This refers to the film and corresponding devices for light-converting materials. Compound 1 was purchased from Shenzhen Ruixun Optoelectronic Materials Technology Co., Ltd.

[0112] This embodiment manufactures the light-converting adhesive film using the following method:

[0113] Based on the total mass of the light-converting adhesive film, 98.9% wt of EVA, 0.5% wt of tert-butyl peroxyisopropyl carbonate as a crosslinking agent, 0.5% wt of trimethylolpropane tetraacrylate as a co-crosslinking agent, and 0.1% wt of compound 1 were mixed evenly and then melt-extruded at 100°C to form a film. The extruded film was then cooled and set at 25°C to obtain a light-converting adhesive film with a thickness of 0.3 mm.

[0114] This embodiment manufactures solar cell modules in the following manner:

[0115] Under a negative pressure environment of 130°C, the encapsulation glass, the above-mentioned light-converting adhesive film, the 182mm HJT solar cell (purchased from Huasheng New Energy Technology Co., Ltd.), pure EVA and glass backsheet were laminated and encapsulated, and the light-converting adhesive film was used as the front surface of the cell to obtain the solar cell module of Example 1.

[0116] Example 2

[0117] The light-converting adhesive film and solar cell module of Example 2 were prepared using a method similar to that of Example 1, except that compound 1 was replaced with an equal mass fraction of compound 2. It was then used in a light-converting adhesive film, ultimately yielding the light-converting adhesive film and solar cell module of Example 2. Compound 2 was purchased from Shenzhen Ruixun Optoelectronic Materials Technology Co., Ltd.

[0118] Example 3

[0119] The light-converting adhesive film and solar cell module of Example 3 were prepared using a method similar to that of Example 1, except that compound 1 was replaced with an equal mass fraction of compound 3. It was then used in a light-converting adhesive film, ultimately yielding the light-converting adhesive film and solar cell module of Example 3. Compound 3 was purchased from Shenzhen Ruixun Optoelectronic Materials Technology Co., Ltd.

[0120] Example 4

[0121] The light-converting adhesive film and solar cell module of Example 4 were prepared using a method similar to that of Example 1, except that compound 1 was replaced with an equal mass fraction of compound 4. It was then used in a light-converting adhesive film, ultimately yielding the light-converting adhesive film and solar cell module of Example 4. Compound 4 was purchased from Shenzhen Ruixun Optoelectronic Materials Technology Co., Ltd.

[0122] Comparative Example 1

[0123] The encapsulant film and solar cell module of Comparative Example 1 were prepared using a method similar to that of Example 1, but with the difference that no light-converting material was added, and the encapsulant film composition was 99.0% wt of EVA, 0.5% wt of tert-butyl peroxycarbonate isopropyl ester and 0.5% wt of trimethylolpropane tetraacrylate.

[0124] Comparative Example 2

[0125] The encapsulant film and solar cell module of Comparative Example 2 were prepared using a method similar to that of Comparative Example 1, except that compound 1 was replaced with an equal mass fraction of triazole material, the molecular structure of which is as follows: The triazole material was purchased from Shanghai Bid Pharmaceutical Technology Co., Ltd.

[0126] Test case

[0127] I. Photophysical Property Testing: Photophysical tests were performed on the light-converting materials and light-converting films in each example and comparative example using a UV-Vis spectrometer, fluorometer, integrating sphere, and xenon lamp. The absorption spectra of the light-converting materials were measured using an Agilent Cary 3500 UV-Vis spectrophotometer. The emission spectra and PLQY of the light-converting materials and the in-situ photoaging (200 W / m) of the light-converting films were also measured. 2 The relative luminescence intensity under continuous xenon lamp irradiation was measured using a Horiba FL-3 spectrometer and its integrating sphere. The results are as follows: Figure 1 , Figure 2 , Figure 3 As shown in Table 1.

[0128] Comparison Table 1 Figure 1 and Figure 2 It can be observed that the light-converting materials based on pyrene and fluorene all exhibit high PLQY, with emission HWB comparable to those of triazole materials. Compounds 1 and 2 show significantly redder emission than triazole materials, which is attributed to the presence of more fluorene groups in these compounds, expanding the conjugated range and causing a redshift in emission. Figure 3 It can be observed that the luminescence decay of the four light-converting materials in this invention is significantly slower than that of the triazole material. This is because the light-converting materials in this invention all have only carbon-carbon single or double bonds, with bond energies all above 4.2 eV (calculated by B3LYP-D3 / 6-31G*), while the carbon-nitrogen single bond energy in triazole is only 3.6 eV, which is closer to the material's excitation energy (3.2 eV). Therefore, it is more likely that the bond energy will break when the material is in the excited state, leading to material degradation.

[0129] Table 1: Comparison of photophysical properties of optical transfer materials in the examples and comparative examples

[0130]

[0131] II. Device Performance Testing: To evaluate the performance of the solar cell modules and illustrate the effectiveness of the present invention, power tests and UV aging tests were conducted on the solar cell modules in each embodiment and comparative example. Power tests were performed using an ANPA1000 tester from Shandong Aino Instruments Co., Ltd., and UV aging was conducted using a 142W multi-expansion UV aging chamber at 70°C at a rate of 120 kWh / m². 2 UV aging, the results are shown in Table 2.

[0132] Table 2 shows that the films containing compounds 1-4 effectively improved device efficiency, with compounds 1 and 2, which have redder emission spectra, showing more significant synergistic effects. This is because silicon-based solar cells have higher utilization efficiency for longer wavelengths of light in the 400-600 nm range. Furthermore, compounds 1-4 significantly inhibited device aging due to the strong absorption of these materials and their inherent stability to ultraviolet light. Compounds 1-3, in particular, exhibit more comprehensive absorption coverage across the ultraviolet and deep blue light regions, thus demonstrating a more pronounced effect in suppressing device aging.

[0133] Table 2: Comparison of device efficiency and attenuation rate in the examples and comparative examples

[0134]

Claims

1. A light conversion film for daylight wavelength conversion, characterized in that The light conversion adhesive film comprises a compound of Formula I and a substrate transparent to visible light, In Formula I, R1 is selected from a hydrogen atom, a C1-C10 alkyl group, a C2-C10 alkenyl group, a C2-C10 alkynyl group, and a C3-C10 cycloalkyl group, the C1-C10 alkyl group, the C2-C10 alkenyl group, the C2-C10 alkynyl group, and the C3-C10 cycloalkyl group as R1 can be substituted with one or more substituents selected from a halogen atom, a hydroxyl group, an amine group, an ester group, an amide group, a C1-C10 alkoxy group, a cyano group, and a trifluoromethyl group; Ar1, Ar2, Ar3, Ar4, and Ar5 are each independently selected from a hydrogen atom, a C6-C20 aryl group, and a 5-20 membered heteroaryl group, the C6-C20 aryl group and the 5-20 membered heteroaryl group as Ar1, Ar2, Ar3, Ar4, and Ar5 can be substituted with one or more substituents selected from a C1-C10 alkyl group, a C2-C10 alkenyl group, and a C2-C10 alkynyl group, the C1-C10 alkyl group, the C2-C10 alkenyl group, and the C2-C10 alkynyl group can be substituted with one or more substituents selected from a halogen atom, a hydroxyl group, an amine group, an ester group, an amide group, a C1-C10 alkoxy group, a cyano group, and a trifluoromethyl group; R2 and R3 are each independently selected from a hydrogen atom, a C1-C10 alkyl group, a C2-C10 alkenyl group, a C2-C10 alkynyl group, a C3-C10 cycloalkyl group, a C6-C20 aryl group, and a 5-20 membered heteroaryl group, the C1-C10 alkyl group, the C2-C10 alkenyl group, the C2-C10 alkynyl group, the C3-C10 cycloalkyl group, the C6-C20 aryl group, and the 5-20 membered heteroaryl group as R2 and R3 can be substituted with one or more substituents selected from a halogen atom, a hydroxyl group, an amine group, an ester group, an amide group, a C1-C10 alkoxy group, a cyano group, and a trifluoromethyl group; Ar6 is selected from a hydrogen atom, a C6-C20 aryl group, and a 5-20 membered heteroaryl group, the C6-C20 aryl group and the 5-20 membered heteroaryl group as Ar6 can be substituted with one or more substituents selected from a C1-C10 alkyl group, the C1-C10 alkyl group can be substituted with one or more substituents selected from a halogen atom, a hydroxyl group, an amine group, an ester group, an amide group, a C1-C10 alkoxy group, a cyano group, and a trifluoromethyl group; At least one of R1, R2, and R3 is not a hydrogen atom; The mass fraction of the compound of Formula I in the light conversion adhesive film is 0.001% to 3%.

2. The light conversion film according to claim 1, wherein The mass fraction of the compound of Formula I in the light conversion adhesive film is 0.01% to 0.5%.

3. The light conversion film according to claim 1, wherein The compound of Formula I has one or more of the following characteristics: Ar1, Ar2, Ar3, Ar4, and Ar5 are each independently selected from a hydrogen atom and a 9H-fluoren-2-yl group, wherein two hydrogen atoms at the 9th position of the 9H-fluoren-2-yl group can be substituted with one or two substituents selected from a C1-C10 alkyl group, a C2-C10 alkenyl group, and a C2-C10 alkynyl group, the C1-C10 alkyl group, the C2-C10 alkenyl group, and the C2-C10 alkynyl group can be substituted with one or more substituents selected from a halogen atom, a hydroxyl group, an amine group, an ester group, an amide group, a C1-C10 alkoxy group, a cyano group, and a trifluoromethyl group; Ar6 is a hydrogen atom or a pyrene-1-yl group which can be substituted with one or more substituents selected from C1-C10 alkyl groups which can be substituted with one or more substituents selected from halogen atoms, hydroxyl groups, amine groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups and trifluoromethyl groups; R1 is selected from a hydrogen atom and C1-C10 alkyl groups, the C1-C10 alkyl groups as R1 can be substituted with one or more substituents selected from halogen atoms, hydroxyl groups, amine groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups and trifluoromethyl groups; R2 and R3 are each independently selected from C1-C10 alkyl groups, the C1-C10 alkyl groups as R2 and R3 can be substituted with one or more substituents selected from halogen atoms, hydroxyl groups, amine groups, ester groups, amide groups, C1-C10 alkoxy groups, cyano groups and trifluoromethyl groups.

4. The light conversion adhesive film according to claim 1, wherein in formula I, Ar1, Ar2 and Ar5 are each independently a 9H-fluoren-2-yl group in which two hydrogen atoms at the 9-position are substituted with two substituents selected from C1-C10 alkyl groups, Ar3 and Ar4 are hydrogen atoms, R1 is selected from a hydrogen atom and C1-C10 alkyl groups, R2 and R3 are each independently selected from C1-C10 alkyl groups, and Ar6 is a hydrogen atom; or in formula I, Ar1, Ar2 and Ar5 are each independently a 9H-fluoren-2-yl group in which two hydrogen atoms at the 9-position are substituted with two substituents selected from C1-C10 alkyl groups, Ar3 and Ar4 are hydrogen atoms, R1 is selected from a hydrogen atom and C1-C10 alkyl groups, R2 and R3 are each independently selected from C1-C10 alkyl groups, and Ar6 is a hydrogen atom; or in formula I, Ar1, Ar2 and Ar5 are each independently a 9H-fluoren-2-yl group in which two hydrogen atoms at the 9-position are substituted with two substituents selected from C1-C10 alkyl groups, Ar3 and Ar4 are hydrogen atoms, R1 is selected from a hydrogen atom and C1-C10 alkyl groups, R2 and R3 are each independently selected from C1-C10 alkyl groups, and Ar6 is a hydrogen atom; or in formula I, Ar1, Ar2 and Ar5 are each independently a 9H-fluoren-2-yl group in which two hydrogen atoms at the 9-position are substituted with two substituents selected from C1-C10 alkyl groups, Ar3 and Ar4 are hydrogen atoms, R1 is selected from a hydrogen atom and C1-C10 alkyl groups, R2 and R3 are each independently selected from C1-C10 alkyl groups, and Ar6 is a hydrogen atom; or in formula I, Ar1, Ar2 and Ar5 are each independently a 9H-fluoren-2-yl group in which two hydrogen atoms at the 9-position are substituted with two substituents selected from C1-C10 alkyl groups, Ar3 and Ar4 are hydrogen atoms, R1 is selected from a hydrogen atom and C1-C10 alkyl groups, R2 and R3 are each independently selected from C1-C10 alkyl groups, and Ar6 is a hydrogen atom; or the compound of formula I is selected from one or more of compounds 1-4:

5. The light conversion film according to claim 1, wherein the light conversion adhesive film has one or more of the following characteristics: Among compounds 1-4, n-C6H 13 n-C6H represents n-hexyl, n-Bu represents n-butyl, and Et represents ethyl.

6. The light converting adhesive film of claim 1, wherein, the substrate is one or more selected from polyethylene terephthalate, polyvinyl butyral, ethylene-vinyl acetate copolymer, polyethylene, ethylene polytetrafluoroethylene, polyimide, polycarbonate, polystyrene, polyurethane, polyacrylate, silicone sol, silicone gel and polyolefin elastomer; the substrate has a refractive index of 1.4-1.7; and the substrate has a thickness of 10-1000 pm. The light conversion adhesive film has a thickness of 0.1-1.0 mm.

7. The light converting film of claim 1, wherein the light converting film has a thickness of 0.5 to 5 microns. The light conversion adhesive film further comprises one or more additives selected from cross-linking agent, co-cross-linking agent, plasticizer, antioxidant and water absorbent; preferably, the light conversion adhesive film comprises cross-linking agent and co-cross-linking agent, and optionally further comprises one or more additives selected from plasticizer, antioxidant and water absorbent.

8. A method of preparing the light conversion adhesive film according to any one of claims 1 to 7, characterized in that, The method comprises: after mixing the components of the light conversion adhesive film uniformly, melt-extruding into a film.

9. A solar cell module characterized by comprising: The solar cell module comprises the light conversion adhesive film according to any one of claims 1-7; Preferably, the solar cell module comprises one or more of the following devices: PN junction device containing III-V or II-IV group elements, Cu-In-Ga-Se thin film device, organic sensitizer device, organic thin film device, quantum dot thin film device, amorphous silicon solar cell, microcrystalline silicon solar cell and crystalline silicon solar device.

10. A method of enhancing the efficiency and stability of a solar cell, characterized by, The method comprises: introducing the light conversion adhesive film according to any one of claims 1-7 into a solar cell; Preferably, the solar cell comprises one or more of the following devices: PN junction device containing III-V or II-IV group elements, Cu-In-Ga-Se thin film device, organic sensitizer device, organic thin film device, quantum dot thin film device, amorphous silicon solar cell device, microcrystalline silicon solar cell device and crystalline silicon solar device.

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